* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* border: 1px solid red; */
    list-style: none;
    text-decoration: none;
}

.coders,
.work,
.blog {
    margin-bottom: 30px;
    /* height: 1000px; */
    width: 100%;
}

.w {
    width: 80%;
    margin: 0 auto;
}

.coders {
    /* height: 1000px; */
    background-color: rgb(32, 27, 24);
}

.head {
    height: 100px;
    margin-bottom: 10px;
}

.head li {
    float: left;
    margin: 0 2%;
    line-height: 98px;
}

.head li a {
    color: white;
}

.nav {
    background-color: rgb(230, 90, 70);
    height: 150px;
    margin-bottom: 10px;
}

.nav_left {
    position: absolute;
    width: 15%;
    left: 10%;
}

.nav_left p {
    text-align: center;
    font-size: 40px;
    line-height: 148px;
}

.nav_right {
    position: relative;
    width: 40%;
    left: 55%;
}

.nav_right li {
    font-size: 25px;
    float: left;
    line-height: 150px;
}

.nav_right li :hover {
    background: #000;
}

.nav_right li a {
    display: inline-block;
    color: white;
    padding: 0 30px;
}

.main {
    margin-bottom: 10px;
}

.tupian {
    border: 2px solid white;
}

.swiper-wrapper {
    border: 2px solid white;
}

.tupian img {
    /* height: 100%; */
    width: 100%;
}

.down {
    height: 200px;
}

.down_left {
    position: absolute;
}

.down_left span {
    color: rgb(230, 90, 70);
    font-size: 40px;
    line-height: 198px;
}

.down_mid {
    position: absolute;
    left: 30%;
    margin-top: 20px;
    border-left: 1px solid white;
    width: 1px;
    height: 160px;
}

.down_right {
    position: relative;
    padding-top: 30px;
    left: 30%;
    width: 60%;
    margin-top: 50px;
}

.down_right li p {
    color: white;
    text-align: center;
    font-size: 20px;
    margin-bottom: 20px;
}

.down_right li button {
    position: relative;
    background-color: rgb(230, 90, 70);
    font-size: 30px;
    width: 20%;
    height: 40px;
    left: 40%;
}

.work {
    margin-bottom: 30px;
}

.work h1 {
    color: rgb(230, 90, 70);
}

.work_main {
    position: relative;
    /* border-bottom: 2px dotted gray; */
    margin-bottom: 20px;
    width: 80%;
    left: 10%;
}

.work_main ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.work_main li {
    position: relative;
    margin: 10px auto;
    float: left;
}

.work_footer {
    margin-top: 50px;
    background-color: lightgrey;
    border-top: 4px dotted gray;
    border-bottom: 4px dotted gray;
}

.work_footer ul li {
    margin-bottom: 20px;
}

.work_footer ul li p {
    text-align: center;
}

#big {
    font-size: 30px;
    color: rgb(230, 90, 70);
}

.work_footer ul li button {
    position: relative;
    background-color: rgb(230, 90, 70);
    height: 30px;
    width: 10%;
    left: 45%;
    border-radius: 2px;
}

.blog h1 {
    color: rgb(230, 90, 70);
}

.blog_up {
    margin-top: 20px;
    position: relative;
    width: 80%;
    left: 10%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.blog_up li {
    float: left;
    margin: 10px;
}

.blog_up li h2 {
    margin-bottom: 25px;
}

.blog_up li img {
    margin-bottom: 15px;
}

#up {
    color: rgb(230, 90, 70);
    margin-bottom: 10px;
}

.message {
    margin-bottom: 10px;
}

.blog_up li button {
    background-color: rgb(230, 90, 70);
    margin-top: 10px;
    width: 30%;
    height: 30px;
}

.blog_down {
    margin-top: 30px;
    height: 300px;
    margin-bottom: 30px;
}

.blog_down_left {
    width: 49%;
    float: left;
}

.blog_down_left li {
    margin: 5px;
    float: left;
}

.blog_down_left li p {
    margin-bottom: 10px;
}

.blog_down_right {
    float: right;
    width: 49%;
}

.blog_down_right ul {
    float: left;
    padding-top: 10px;
    margin: 4%;
}

.blog_down_right ul li {
    margin: 10px;
}

.blog_down_right ul li a {
    color: rgb(230, 90, 70);
}

.blog_footer {
    position: relative;
    width: 30%;
    left: 40%;
}

.blog_footer p {
    line-height: 50px;
    text-align: center;
}